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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.3.45.192/26
network10.3.45.192/26
broadcast10.3.45.255
first host10.3.45.193
last host10.3.45.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.45.192/26
address00001010.00000011.00101101.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.00101101.11000000
broadcast00001010.00000011.00101101.11111111
green = network part, grey = host part
hex0x0a032dc0
decimal167980480
reverse dns192.45.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:2dc0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.45.192/3210.3.45.192 – 10.3.45.19210.3.45.192
210.3.45.193/3210.3.45.193 – 10.3.45.19310.3.45.193
310.3.45.194/3210.3.45.194 – 10.3.45.19410.3.45.194
410.3.45.195/3210.3.45.195 – 10.3.45.19510.3.45.195
510.3.45.196/3210.3.45.196 – 10.3.45.19610.3.45.196
610.3.45.197/3210.3.45.197 – 10.3.45.19710.3.45.197
710.3.45.198/3210.3.45.198 – 10.3.45.19810.3.45.198
810.3.45.199/3210.3.45.199 – 10.3.45.19910.3.45.199
910.3.45.200/3210.3.45.200 – 10.3.45.20010.3.45.200
1010.3.45.201/3210.3.45.201 – 10.3.45.20110.3.45.201
1110.3.45.202/3210.3.45.202 – 10.3.45.20210.3.45.202
1210.3.45.203/3210.3.45.203 – 10.3.45.20310.3.45.203
1310.3.45.204/3210.3.45.204 – 10.3.45.20410.3.45.204
1410.3.45.205/3210.3.45.205 – 10.3.45.20510.3.45.205
1510.3.45.206/3210.3.45.206 – 10.3.45.20610.3.45.206
1610.3.45.207/3210.3.45.207 – 10.3.45.20710.3.45.207
1710.3.45.208/3210.3.45.208 – 10.3.45.20810.3.45.208
1810.3.45.209/3210.3.45.209 – 10.3.45.20910.3.45.209
1910.3.45.210/3210.3.45.210 – 10.3.45.21010.3.45.210
2010.3.45.211/3210.3.45.211 – 10.3.45.21110.3.45.211
2110.3.45.212/3210.3.45.212 – 10.3.45.21210.3.45.212
2210.3.45.213/3210.3.45.213 – 10.3.45.21310.3.45.213
2310.3.45.214/3210.3.45.214 – 10.3.45.21410.3.45.214
2410.3.45.215/3210.3.45.215 – 10.3.45.21510.3.45.215
2510.3.45.216/3210.3.45.216 – 10.3.45.21610.3.45.216
2610.3.45.217/3210.3.45.217 – 10.3.45.21710.3.45.217
2710.3.45.218/3210.3.45.218 – 10.3.45.21810.3.45.218
2810.3.45.219/3210.3.45.219 – 10.3.45.21910.3.45.219
2910.3.45.220/3210.3.45.220 – 10.3.45.22010.3.45.220
3010.3.45.221/3210.3.45.221 – 10.3.45.22110.3.45.221
3110.3.45.222/3210.3.45.222 – 10.3.45.22210.3.45.222
3210.3.45.223/3210.3.45.223 – 10.3.45.22310.3.45.223
3310.3.45.224/3210.3.45.224 – 10.3.45.22410.3.45.224
3410.3.45.225/3210.3.45.225 – 10.3.45.22510.3.45.225
3510.3.45.226/3210.3.45.226 – 10.3.45.22610.3.45.226
3610.3.45.227/3210.3.45.227 – 10.3.45.22710.3.45.227
3710.3.45.228/3210.3.45.228 – 10.3.45.22810.3.45.228
3810.3.45.229/3210.3.45.229 – 10.3.45.22910.3.45.229
3910.3.45.230/3210.3.45.230 – 10.3.45.23010.3.45.230
4010.3.45.231/3210.3.45.231 – 10.3.45.23110.3.45.231
4110.3.45.232/3210.3.45.232 – 10.3.45.23210.3.45.232
4210.3.45.233/3210.3.45.233 – 10.3.45.23310.3.45.233
4310.3.45.234/3210.3.45.234 – 10.3.45.23410.3.45.234
4410.3.45.235/3210.3.45.235 – 10.3.45.23510.3.45.235
4510.3.45.236/3210.3.45.236 – 10.3.45.23610.3.45.236
4610.3.45.237/3210.3.45.237 – 10.3.45.23710.3.45.237
4710.3.45.238/3210.3.45.238 – 10.3.45.23810.3.45.238
4810.3.45.239/3210.3.45.239 – 10.3.45.23910.3.45.239
4910.3.45.240/3210.3.45.240 – 10.3.45.24010.3.45.240
5010.3.45.241/3210.3.45.241 – 10.3.45.24110.3.45.241
5110.3.45.242/3210.3.45.242 – 10.3.45.24210.3.45.242
5210.3.45.243/3210.3.45.243 – 10.3.45.24310.3.45.243
5310.3.45.244/3210.3.45.244 – 10.3.45.24410.3.45.244
5410.3.45.245/3210.3.45.245 – 10.3.45.24510.3.45.245
5510.3.45.246/3210.3.45.246 – 10.3.45.24610.3.45.246
5610.3.45.247/3210.3.45.247 – 10.3.45.24710.3.45.247
5710.3.45.248/3210.3.45.248 – 10.3.45.24810.3.45.248
5810.3.45.249/3210.3.45.249 – 10.3.45.24910.3.45.249
5910.3.45.250/3210.3.45.250 – 10.3.45.25010.3.45.250
6010.3.45.251/3210.3.45.251 – 10.3.45.25110.3.45.251
6110.3.45.252/3210.3.45.252 – 10.3.45.25210.3.45.252
6210.3.45.253/3210.3.45.253 – 10.3.45.25310.3.45.253
6310.3.45.254/3210.3.45.254 – 10.3.45.25410.3.45.254
6410.3.45.255/3210.3.45.255 – 10.3.45.25510.3.45.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /26
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →